https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113257
--- Comment #4 from Richard Earnshaw <rearnsha at gcc dot gnu.org> --- I'm not sure. My understanding was that -march=native started by looking up the CPU ID first and then using the internal mapping of that CPU to the architecture (which can't work if we don't recognize the CPU), but perhaps we try a bit harder when both are specified.
